Exam 38: Human Influences on the Living World

Which of the following is the reason why the sub-Saharan population projections for the year 2025 have been scaled back from 1.33 billion to 1.05 billion people?

When a new species enters a new habitat and colonizes it,it may do so at the expense of native species.

A lack of ozone is dangerous because ozone:

_________________ is the most abundant greenhouse gas.

Explain the cause of the greenhouse effect.

The pH of rain and snow in the eastern United States is now:

The greenhouse effect will probably have both positive and negative effects on agriculture.

One reason industrial pollution is such a problem is because:

All of the following characteristics describe a developing country except:

Global warming is predicted to have an effect on all of the following except:

The human population is expected to double in _____ years.

Ten thousand years ago,when human populations began growing in number,the main reason was:

Groundwater came to be in the ground how long ago?

Our environmental problems can be solved by:

The Clean Air Act of 1990 was important because it specifically:

What alternatives can you think of to lessen the need for agricultural chemicals?

The number of species inhabiting an ecosystem is referred to as ___________________.

How many species of animals and plants will go extinct in our lifetimes?

Agricultural chemicals include such things as _________________.

How do you think our overpopulation problem will be solved? Support your answer with specific examples or ideas.